The latest update to FolderWatch, a Mac app that automatically synchronizes your files across different locations, lists “Retina Graphics” as one of its new features — fueling rumors surrounding Apple’s upcoming MacBooks.

Apple has also supported a “HiDPI” display mode for some time now in Mac OSX Lion and Mountain Lion. Apps like Air Display have already been updated to support HiDPI mode, which would technically make them “Retina Display ready” as well.

I asked the Brothers Roloff on Twitter to clarify how FolderWatch is Retina ready, and they confirmed that they meant the app is HiDPI ready. So despite how much we’d like to believe this is a sign of new MacBooks, this update just tells us the Brothers Roloff are future-proofing their app.

Apple CEO Tim Cook recently said the company would be doubling down on secrecy. So even if Apple gave developers an early warning about new Retina Displays, the company would have prevented them from revealing any updated apps until its new computers were officially unveiled.